Simulating Heat Transfer During Transient Dropwise Condensation on a Low-Thermal-Conductivity Substrate

Langmuir : the ACS Journal of Surfaces and Colloids
Ashley M MacnerPaul H Steen

Abstract

The instantaneous heat-transfer performance of a surface is dictated by the number and sizes of drops on the surface. While performance averaged over longer times is of interest from a technology standpoint, accurate simulation of the transient state is important in condenser design because the maximum heat rejection of the surface occurs in this range. Steady-state dropwise condensation can be thought of as a collection of transient dropwise condensation cycles occurring in parallel. Traditional simulation of dropwise condensation has focused on making comparisons with experimental drop-size distributions at later times, after the process has reached a statistical stationary phase where the heat transfer is lower. Understanding how to model and simulate transient dropwise condensation where a maximum in heat transfer occurs will help us design higher heat-rejecting surfaces. Additionally, a constant temperature difference between the steam and the surface below the drop is assumed. While often valid, there are some cases where this is not valid, and measuring the drop growth rate is required. We report a way to simulate transient dropwise condensation using a measured population averaged drop growth rate. The simulation reason...Continue Reading

References

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Feb 5, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Ashley M MacnerPaul H Steen

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